NEW YORK - May 26, 2010 - The U.S. national debt has passed the $13 trillion mark, according to USDebtClock.org, an independent website that tracks the real-time growth of U.S. revenues and spending.

On Tuesday, the national debt stood at $12,995,779,490,444.52, according to the Treasury Department's national debt-tracking website TreasuryDirect.gov.

The Treasury Department did not immediately return a request from ABC News for comment.

Senate Minority Leader Mitch McConnell, R-Ky., wasted no time in sounding an alarm about the new debt milestone. In a statement released today, McConnell cited the debt in his criticism of what's called the tax extenders bill, which would extend unemployment benefits and the amount of time unemployed workers could stay on their group health plan through COBRA, as well as certain tax cuts. McConnell said the bill would cost $130 billion.

"As early as today, we'll reach a dubious milestone in America: a $13 trillion national debt - the first time in history we've crossed this frightening threshold. This extenders bill would add another $130 billion on top of that.. This is fiscal recklessness.”